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2003 Course Computer Networks

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Total No. of Questions : 12] P1479 [Total No. of Pages :3 [3764] - 241 B.E. (Electronics) COMPUTER NETWORKS (2003 Course) Time : 3 Hours] [Max. Marks:100 Instructions to the candidates: 1) Answers to the two sections should be written in separate books. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. 4) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) Suggest various network topologies for : i) Broadcast networks ii) Point to Point network List their advantages and disadvantages. [8] b) What is the principal difference between connectionless communication and connection oriented communication. [4] c) What are headers and trailers and how do they get added and removed? [4] OR Q2) a) Explain the service primitives used in connected oriented services. [6] b) List similarities and differences between OSI and TCP/IP reference model. [6] c) Which OSI layer is responsible for the following? i) Determining the best path to route packets. ii) Providing end-to-end communication with reliable service. iii) Determining the size of packets. iv) Carrying the packets. [4] P.T.O. Q3) a) Give a brief description of the application and limitation of the following types of transmission media: [12] i) Twisted pair. ii) Fiber optic cable iii) Coaxial cable iv) Microwaves. b) Calculate the maximum achievable data rate for a binary signal transmitted [4] over a 3kHz channel with SNR 20dB. OR Q4) a) Explain why bandwidth of twisted pair and coaxial cable decreases with distance. [4] b) It is required to transmit a data at a rate of 64kbps over a 3kHz telephone channel. What is the minimum SNR required to accomplish this? [4] c) Explain packet, circuit and message switching with examples. [8] Q5) a) Let g( x )=x3+x+ 1. Consider the information sequence 1001. i) Find the codeword corresponding to the information sequence given. ii) Suppose that the code word has a transmission error in the first bit. What will be the syndrome generated at the receiver? [6] b) Discuss in detail the HDLC protocol. What are the similarities and differences between PPP and HDLC? [6] c) Write down the problems that are encountered in building the bridge between: [6] i) 802.3, 802.4 ii) 802.4, 802.5 OR Q6) a) Suppose transmission channels become virtually error free is the data link layer still needed? Justify. [4] b) What is sliding window protocol? What is the importance of the size of window? [8] c) What is piggybacking? What is the significance of piggy backing? Give with an example. [6] [3764]-241 2 SECTION - II Q7) a) b) c) List the goals of the Network Layer. Define routing, flooding. [8] Explain the congestion prevention policies of transport layer, network layer and data link layer. [6] How does a router differ from a bridge? [4] OR Q8) a) b) c) Answer briefly crash recovery in the transport layer? [6] List the properties of routing algorithm used in computer networks. What is the Optimality-principle ? [6] Explain various congestion control techniques. [6] Q9) a) b) c) What is DNS? What resource records are associated with it? Explain the five basic functions in Electronic mail. Explain DES. OR [6] [4] [6] Q10)a) Discuss security issues of intranet & internet. [4] b) Write short note on : i) Video on Demand. ii) Web page in HTML. iii) Email. [12] Q11)a) Draw IP address formats for Class A, Class B, C, D and E using suitable example and give range of each. What is the significance of sub-netting?[8] b) What are the major goals of lPv6. Give the difference between IPv4 and IPv6. [8] OR Q12)a) b) Explain in detail the layered architecture of TCP/IP protocol suite. [4] Write short note on : i) FTP. ii) BOOTP. iii) SMTP. iv) Trace route. [12] kbkb [3764]-241 3

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